JP6359313B2 - Waste liquid treatment system and waste liquid treatment method - Google Patents

Description

  The present invention relates to a waste liquid treatment system and a waste liquid treatment method.

  In radiation handling facilities such as nuclear power plants and spent fuel reprocessing plants, structural parts such as piping and equipment that come into contact with radioactive waste liquid containing radioactive materials are exposed to radioactive materials on the inner surface of the radiation handling facility. A film such as an oxide or salt containing is attached or generated. If the operation period of the facility becomes longer, the radiation dose around the structural parts will increase, and there is a risk that the radiation dose to workers will increase during periodic inspections, maintenance work or waste demolition work. In order to reduce the exposure of workers, it is necessary to remove (decontaminate) the radioactive material adhering to the structural parts.

  The decontamination waste liquid generated by decontamination of equipment in such a radiation handling facility chemically absorbs radioactive substances such as metal ions contained in the decontamination solution using an inorganic ion exchanger or anion exchange resin, for example. A method has been proposed (see, for example, Patent Document 1).

JP2013-221898A

  In the waste liquid treatment method for decontamination waste liquid, the inorganic ion exchanger is only an adsorbed radioactive material accompanying a predetermined metal ion and is an inorganic substance. By solidifying it into a solid material, it can be buried in a disposal site. However, in this waste liquid treatment method of decontamination waste liquid, it is necessary to remove most of the radioactive substances with an inorganic ion exchanger, but it is actually difficult, and in reality, an organic exchange resin must be used, This organic matter will be generated as secondary waste. Organic secondary wastes cannot be disposed of at high doses due to the possibility of hydrogen explosion and explosion due to radioactive decomposition, and must be stored in the plant. Therefore, it is desired to reduce the radiation dose of organic secondary waste to a level that can be disposed of.

  The present invention has been made in view of the above, and provides a waste liquid treatment system and a decontamination waste liquid treatment method capable of reducing the radiation dose of organic secondary waste to a disposable level. Objective.

  In order to achieve the above object, a waste liquid treatment system according to a first aspect of the present invention is provided in a decontamination waste liquid line for circulating a decontamination waste liquid generated when a decontamination target system is decontaminated, and the decontamination waste liquid line. The inorganic ion exchanger filling tank provided with an inorganic ion exchanger that adsorbs predetermined metal ions contained in the decontamination waste liquid, and the inorganic ion exchanger filling tank provided in the decontamination waste liquid line A cation resin tower provided with a cation exchange resin that adsorbs other metal ions of the predetermined metal ions contained in the decontamination waste liquid, and the decontamination that is provided in the decontamination waste liquid line and passes through the cation resin tower. An anion resin tower provided with an anion exchange resin that adsorbs an anion contained in the waste liquid.

  According to this waste liquid treatment system, after removing predetermined metal ions in the decontamination waste liquid generated by decontaminating the decontamination target system by adsorbing to the inorganic ion exchanger, other metal ions in the decontamination waste liquid Is removed by adsorption with a cation exchange resin, and then the anions in the decontamination waste liquid are removed by adsorption with an anion exchange resin. For this reason, the radiation dose of the cation exchange resin and anion exchange resin generated as secondary waste can be reduced. As a result, the inorganic ion exchanger can be disposed as a waste and the cation exchange resin and the anion exchange resin can be incinerated.

  The waste liquid treatment system according to a second aspect is characterized in that, in the first aspect, the inorganic ion exchanger in the inorganic ion exchanger filling tank selectively adsorbs cobalt and nickel as predetermined metal ions. .

  According to this waste liquid treatment system, cobalt and nickel, which are predetermined metal ions, become a high dose by decontamination, and a high removal rate (approximately 90%) is achieved by selectively adsorbing cobalt and nickel with an inorganic ion exchanger. ˜95%), the radioactive substance can be removed, and the radiation dose of the cation exchange resin by adsorbing other metal ions with the subsequent cation exchange resin can be kept low. As a result, by adsorbing the prescribed metal ions, the inorganic ion exchanger can be suppressed to a radiation dose that can be buried at the disposal site, and the cation exchange resin can be suppressed to a radiation dose that can be incinerated. Can do.

  The waste liquid treatment system according to a third aspect is characterized in that, in the first or second aspect, the inorganic ion exchanger is zeolite.

  According to this waste liquid treatment system, zeolite adsorbs cobalt and nickel, which are predetermined metal ions, and can remove radioactive substances with a high removal rate (approximately 90% to 95%). The radiation dose of the cation exchange resin by adsorbing other metal ions with the exchange resin can be kept low. As a result, by adsorbing predetermined metal ions, the cation exchange resin can be suppressed to a radiation dose within a range that can be incinerated.

  The waste liquid treatment system according to a fourth aspect of the present invention is the inorganic ion exchanger according to any one of the first to third aspects, wherein the decontamination waste liquid line is connected to the inlet side and the outlet side of the inorganic ion exchanger filling tank. A filling tank line, a cation resin tower line connecting the decontamination waste liquid line and the inlet side and outlet side of the cation resin tower, and a connection between the decontamination waste liquid line and the inlet side and outlet side of the anion resin tower. An anion resin tower line.

  According to this waste liquid treatment system, the inlet side and the outlet side of the inorganic ion exchanger filling tank, the inlet side and the outlet side of the cation resin tower, the inlet side and the outlet side of the anion resin tower are respectively an inorganic ion exchanger filling tank line, By connecting to the decontamination waste liquid line independently in the cation resin tower line and the anion resin tower line, maintenance of the inorganic ion exchanger filling tank, the cation resin tower, and the anion resin tower can be performed, thereby improving maintainability. Can do.

  A waste liquid treatment system according to a fifth aspect of the present invention is the inorganic ion exchanger filling tank inlet that connects the decontamination waste liquid line and the inlet side of the inorganic ion exchanger filling tank in any one of the first to third inventions. A cation resin tower outlet connecting a line, a relay line connecting the outlet side of the inorganic ion exchanger filling tank and the inlet side of the cation resin tower, and an outlet side of the cation resin tower and the decontamination waste liquid line. And an anion resin tower line connecting the decontamination waste liquid line and the inlet side and the outlet side of the anion resin tower.

  According to this waste liquid treatment system, the outlet side of the inorganic ion exchanger filling tank and the inlet side of the cation resin tower are connected by a relay line, so that the inorganic ion exchanger filling tank is continuously connected to the cation resin tower. Decontamination waste liquid can be introduced directly. For this reason, the valve can be omitted as compared with the configuration in which the inorganic ion exchanger filling tank and the cation resin tower are independently connected to the decontamination waste liquid line, and after being supplied to the inorganic ion exchanger filling tank Since the decontamination waste liquid is always supplied to the cationic resin tower, the processing efficiency can be improved.

  In order to achieve the above-mentioned object, the waste liquid treatment method according to the sixth aspect of the present invention uses, as an inorganic ion exchanger, predetermined metal ions dissolved in the decontamination waste liquid generated when the system to be decontaminated is decontaminated. An inorganic ion exchanger permeation step for adsorbing, and a cation resin permeation step for adsorbing other metal ions of a predetermined metal ion dissolved in the decontamination waste liquid to the cation exchange resin after the inorganic ion exchanger permeation step And an anion resin permeation step for adsorbing anions in the decontamination waste liquid to the anion exchange resin after the permeation step.

  According to this waste liquid treatment method, after removing predetermined metal ions in the decontamination waste liquid generated by decontaminating the decontamination target system by adsorbing to the inorganic ion exchanger, other metal ions in the decontamination waste liquid Is removed by adsorption with a cation exchange resin, and then the anions in the decontamination waste liquid are removed by adsorption with an anion exchange resin. For this reason, the radiation dose of the cation exchange resin and anion exchange resin generated as secondary waste can be reduced. As a result, the inorganic ion exchanger can be disposed as a waste and the cation exchange resin and the anion exchange resin can be incinerated.

  According to a seventh aspect of the present invention, there is provided a waste liquid treatment method according to the sixth aspect, wherein the inorganic ion exchanger permeation step selectively adsorbs cobalt and nickel, which are predetermined metal ions, to the inorganic ion exchanger. .

  According to this waste liquid treatment method, cobalt and nickel, which are predetermined metal ions, become a high dose by decontamination, and a high removal rate (approximately 90%) is obtained by selectively adsorbing cobalt and nickel with an inorganic ion exchanger. ˜95%), the radioactive substance can be removed, and the radiation dose of the cation exchange resin by adsorbing other metal ions with the subsequent cation exchange resin can be kept low. As a result, by adsorbing predetermined metal ions, the cation exchange resin can be suppressed to a radiation dose within a range that can be incinerated.

  According to the present invention, the radiation dose of organic secondary waste can be reduced.

FIG. 1 is a schematic configuration diagram of a nuclear power plant to which a waste liquid treatment system according to an embodiment of the present invention is applied. FIG. 2 is a configuration diagram of the waste liquid treatment system according to the embodiment of the present invention. FIG. 3 is a flowchart showing the procedure of the waste liquid processing method, which is an operation of the waste liquid processing system according to the embodiment of the present invention. FIG. 4 is an explanatory view showing the steps of the waste liquid treatment method according to the embodiment of the present invention. FIG. 5 is an explanatory diagram showing the steps of the waste liquid treatment method according to the embodiment of the present invention. FIG. 6 is an explanatory diagram showing the steps of the waste liquid treatment method according to the embodiment of the present invention. FIG. 7 is an explanatory diagram showing the steps of the waste liquid treatment method according to the embodiment of the present invention. FIG. 8 is an explanatory diagram showing the steps of the waste liquid treatment method according to the embodiment of the present invention. FIG. 9 is an explanatory diagram showing the steps of the waste liquid treatment method according to the embodiment of the present invention. FIG. 10 is another configuration diagram of the waste liquid treatment system according to the embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[Nuclear Power Plant]
The waste liquid treatment system according to the present embodiment can be applied to a nuclear power plant. In the nuclear power plant described below in the present embodiment, the nuclear reactor uses light water as a reactor coolant and a neutron moderator, and uses high-temperature high-pressure water that does not boil over the entire primary system. This is a pressurized water reactor (PWR) that generates steam by exchanging heat with the secondary coolant and generating steam by sending this steam to a turbine generator. The present embodiment is not limited to a pressurized water reactor, but is applied to an improved pressurized water reactor (APWR) or a boiling water reactor (BWR) improved. be able to. It can also be applied to radiation handling facilities.

  FIG. 1 is a schematic configuration diagram of a nuclear power plant to which a waste liquid treatment system according to this embodiment is applied. As shown in FIG. 1, a nuclear power plant 10 includes a reactor cooling system (hereinafter also referred to as a primary system) 12 including a nuclear reactor 11 and a turbine system (hereinafter referred to as a secondary system) that exchanges heat with the reactor cooling system 12. 13). Reactor coolant (primary cooling water) flows through the reactor cooling system 12, and secondary coolant (secondary cooling water) flows through the turbine system 13.

  The reactor cooling system (primary system) 12 includes a nuclear reactor 11 and a steam generator 16 connected to the nuclear reactor 11 via a cold leg 15a and a hot leg 15b. Further, the pressurizer 17 is interposed in the hot leg 15b, and the reactor coolant pump 18 is interposed in the cold leg 15a. The reactor 11, the cold leg 15 a, the hot leg 15 b, the steam generator 16, the pressurizer 17, and the reactor coolant pump 18 are accommodated in the reactor containment vessel 19.

  The reactor 11 is a pressurized water reactor as described above, and the inside thereof is filled with a reactor coolant (primary cooling water). The nuclear reactor 11 accommodates a large number of fuel assemblies 21. Further, in the nuclear reactor 11, a large number of control rods 22 that control nuclear fission of nuclear fuel in the fuel rods of the fuel assemblies 21 are provided so as to be inserted into the fuel assemblies 21.

  When the nuclear fuel in the fuel rod of the fuel assembly 21 is fissioned while controlling the fission reaction by the control rod 22, thermal energy is generated by this fission. The generated thermal energy heats the reactor coolant, and the heated reactor coolant is sent to the steam generator 16 via the hot leg 15b. On the other hand, the reactor coolant sent from each steam generator 16 via the cold leg 15 a flows into the reactor 11 and cools the reactor 11.

  The pressurizer 17 interposed in the hot leg 15b suppresses boiling of the reactor coolant by pressurizing the reactor coolant that has become high temperature. Further, the steam generator 16 evaporates the secondary coolant by causing the reactor coolant (primary cooling water), which has become high temperature and high pressure, to exchange heat with the secondary coolant (secondary cooling water), thereby generating steam. The reactor coolant generated and cooled to high temperature and pressure is cooled. The reactor coolant pump 18 circulates the reactor coolant in the reactor cooling system 12, and sends the reactor coolant from the steam generator 16 to the reactor 11 via the cold leg 15a and also the reactor coolant. From the nuclear reactor 11 to the steam generator 16 via the hot leg 15b.

  The reactor coolant circulates between the reactor 11 and the steam generator 16. The reactor coolant is light water used as a coolant and a neutron moderator.

  The turbine system (secondary system) 13 includes a turbine 25 connected to each steam generator 16 via a steam pipe 24, a condenser 26 connected to the turbine 25, a condenser 26, and each steam generator. And a water supply pump 28 interposed in a water supply pipe 27 that connects to the water supply pipe 27. The turbine 25 is connected to a generator 29.

  A series of operations in the turbine system 13 will be described. When steam flows from the steam generator 16 into the turbine 25 through the steam pipe 24, the turbine 25 rotates. When the turbine 25 rotates, the generator 29 connected to the turbine 25 generates power. Thereafter, the steam discharged from the turbine 25 flows into the condenser 26. The condenser 26 has a cooling pipe 30 disposed therein, and one of the cooling pipes 30 is connected to a water intake pipe 31 for supplying cooling water (for example, seawater). Is connected to a drain pipe 32 for draining the cooling water. The condenser 26 cools the steam flowing in from the turbine 25 by the cooling pipe 30, thereby returning the steam to a liquid. The secondary coolant that has become liquid is sent to the steam generator 16 via the feed water pipe 27 by the feed water pump 28. The secondary coolant sent to the steam generator 16 becomes steam again by exchanging heat with the reactor coolant in the steam generator 16.

  In such a nuclear power plant 10, structural parts constituting the nuclear reactor equipment such as nuclear reactor equipment and various pipes are generally made of a steel material such as stainless steel or carbon steel. This structural component is corroded by contact with high temperature water (primary cooling water) as the nuclear power plant 10 is operated, and an oxide film is formed. The film is made of at least one metal or oxide of RI, Cr, Fe, and Ni.

  And if the radioactivity in a reactor water is taken in to the film | membrane formed in the structural component exposed to high temperature water (primary cooling water), it will become an exposure radiation source. For this reason, there is a risk that the exposure dose of workers will increase during periodic inspections, maintenance work or waste dismantling work. In order to reduce the exposure of workers, it is necessary to decontaminate radioactive material adhering to structural parts. Such a system for decontamination of structural parts is decontaminated using the waste liquid treatment system according to the present embodiment. In addition, decontamination means removing the radioactive substance adhering to a structural component.

[Waste liquid treatment system and waste liquid treatment method]
FIG. 2 is a configuration diagram of the waste liquid treatment system according to the present embodiment. As shown in FIG. 2, the waste liquid treatment system 40 according to the present embodiment is for decontamination of a decontamination target system 41 of a reactor facility, and an inorganic ion exchanger filling tank is provided in the decontamination waste liquid line L11. 42, a cation resin tower 43, an anion resin tower 44, a chemical solution supply unit 45, and an ultraviolet tower (UV tower) 46. As described above, the decontamination target system 41 is a structural component that constitutes the reactor equipment such as reactor equipment and various pipes.

  The decontamination waste liquid line L11 is a line for extracting the chemical liquid (first chemical liquid 52, second chemical liquid 53, and third chemical liquid 54) supplied to the decontamination target system 41 from the decontamination target system 41 as the decontamination waste liquid 58. . In the present embodiment, the decontamination waste liquid line L11 supplies chemical liquids (first chemical liquid 52, second chemical liquid 53, and third chemical liquid 54) to the decontamination target system 41, while removing the chemical liquid as the decontamination waste liquid 58. A circulation line is extracted from the dyeing target system 41 and returned to the decontamination target system 41. The decontamination waste liquid 58 is a waste liquid generated when the chemical liquid (the first chemical liquid 52, the second chemical liquid 53, and the third chemical liquid 54) passes through the decontamination target system 41.

  The decontamination waste liquid line L11 is arranged along the flow direction of the decontamination waste liquid 58 extracted from the decontamination target system 41, and includes a valve V11, a filter 59, a valve V12, a heating device 60, a pump P1, and an inorganic ion exchanger filling tank 42. A cationic resin tower 43, an anion resin tower 44, a chemical solution supply unit 45, an ultraviolet tower 46, and a valve V13 are provided.

  The valve V11 is an on-off valve provided at an end of the decontamination waste liquid line L11 on the side where the decontamination waste liquid 58 is extracted from the decontamination target system 41, and is extracted from the decontamination target system 41 to the decontamination waste liquid line L11. The distribution of the decontamination waste liquid 58 to be discharged and the backflow of the decontamination waste liquid 58 from the decontamination waste liquid line L11 to the decontamination target system 41 are opened and closed.

  The filter 59 removes deposits in the decontamination waste liquid 58 that flows through the decontamination waste liquid line L11. An example of the filter 59 is poremet.

  The valve V12 is a regulating valve and adjusts the discharge amount of the decontamination waste liquid 58 discharged from the filter 59.

  The heating device 60 includes a heating tank 61 that stores the decontamination waste liquid 58, and heating means 62 provided in the heating tank 61. As the heating means 62, for example, a heater or the like is used. The warming device 60 warms the decontamination waste liquid 58 stored in the warming tank 61 to a predetermined temperature by the heating means 62.

  The pump P1 pumps the decontamination waste liquid 58 at a predetermined flow rate to the decontamination waste liquid line L11. That is, the pump P1 supplies the chemical liquid from the decontamination waste liquid line L11 to the decontamination target system 41, and extracts and circulates the decontamination waste liquid 58 that is a chemical liquid from the decontamination target system 41 to the decontamination waste liquid line L11.

  The inorganic ion exchanger filling tank 42 is a tank provided with an inorganic ion exchanger that adsorbs predetermined metal ions contained in the decontamination waste liquid 58. The predetermined metal ions are cobalt (Co) and nickel (Ni). In the present embodiment, zeolite is used as the inorganic ion exchanger. The inorganic ion exchanger is not limited to zeolite, for example, zirconium phosphate, clay mineral, antimony inorganic ion exchanger, non-zeolite inorganic ion exchanger such as bismuth inorganic ion exchanger, It can select suitably according to the kind of metal ion which should be removed. In the present embodiment, one inorganic ion exchanger filling tank 42 is shown in the figure, but the present invention is not limited to this, and a plurality may be provided in series or in parallel.

  The inorganic ion exchanger filling tank 42 is connected to the decontamination waste liquid line L11 via the inorganic ion exchanger filling tank line L12. The inorganic ion exchanger filling tank line L12 has an inorganic ion exchanger filling tank inlet line L12-1 and an inorganic ion exchanger filling tank outlet line L12-2. The inorganic ion exchanger filling tank inlet line L12-1 connects the upstream side in the flow direction in the decontamination waste liquid line L11 and the inlet side of the inorganic ion exchanger filling tank 42. The inorganic ion exchanger filling tank outlet line L12-2 connects the downstream side in the flow direction in the decontamination waste liquid line L11 and the outlet side of the inorganic ion exchanger filling tank 42. That is, the decontamination waste liquid 58 distributed to the decontamination waste liquid line L11 is introduced from the decontamination waste liquid line L11 into the inorganic ion exchanger filling tank 42 via the inorganic ion exchanger filling tank inlet line L12-1. The decontamination waste liquid 58 introduced into the inorganic ion exchanger filling tank 42 is discharged to the decontamination waste liquid line L11 via the inorganic ion exchanger filling tank outlet line L12-2.

  A valve V21 and a valve V22 are provided in the inorganic ion exchanger filling tank inlet line L12-1 and the inorganic ion exchanger filling tank outlet line L12-2 of the inorganic ion exchanger filling tank line L12. The valves V21 and V22 are open / close valves, each of which opens and closes the inorganic ion exchanger filling tank inlet line L12-1 and the inorganic ion exchanger filling tank outlet line L12-2, thereby filling the inorganic ion exchanger. The flow of the decontamination waste liquid 58 in the tank inlet line L12-1 and the inorganic ion exchanger filling tank outlet line L12-2 is opened and closed.

  The cation resin tower 43 adsorbs other metal ions that are metal ions that are cations contained in the decontamination waste liquid 58 and that are adsorbed by the inorganic ion exchanger in the inorganic ion exchanger filling tank 42. It is a tower equipped with a cation exchange resin. In the present embodiment, one cation resin tower 43 is shown in the figure, but the present invention is not limited to this, and a plurality may be provided in series or in parallel.

  The cation resin tower 43 is connected to the decontamination waste liquid line L11 via the cation resin tower line L13. The cationic resin tower line L13 has a cationic resin tower inlet line L13-1 and a cationic resin tower outlet line L13-2. The cationic resin tower inlet line L13-1 connects the upstream side in the flow direction in the decontamination waste liquid line L11 and the inlet side of the cationic resin tower 43. The cation resin tower outlet line L13-2 connects the downstream side in the flow direction in the decontamination waste liquid line L11 and the outlet side of the cation resin tower 43. That is, the decontamination waste liquid 58 distributed to the decontamination waste liquid line L11 is introduced into the cation resin tower 43 from the decontamination waste liquid line L11 via the cation resin tower inlet line L13-1. The decontamination waste liquid 58 introduced into the cation resin tower 43 is discharged to the decontamination waste liquid line L11 via the cation resin tower outlet line L13-2.

  The cation resin tower inlet line L13-1 and the cation resin tower outlet line L13-2 of the cation resin tower line L13 are provided with a valve V23 and a valve V24. The valves V23 and V24 are open / close valves, each of which opens and closes the cation resin tower inlet line L13-1 and the cation resin tower outlet line L13-2, thereby cation resin tower inlet line L13-1 and cation The flow of the decontamination waste liquid 58 in the resin tower outlet line L13-2 is opened and closed.

  The anion resin tower 44 is a tower provided with an anion exchange resin that adsorbs anions contained in the decontamination waste liquid 58. In the present embodiment, one anion resin tower 44 is shown in the figure, but the present invention is not limited to this, and a plurality may be provided in series or in parallel.

  The anion resin tower 44 is connected to the decontamination waste liquid line L11 via the anion resin tower line L14. The anion resin tower line L14 has an anion resin tower inlet line L14-1 and an anion resin tower outlet line L14-2. The anion resin tower inlet line L14-1 connects the upstream side in the flow direction in the decontamination waste liquid line L11 and the inlet side of the anion resin tower 44. The anion resin tower outlet line L14-2 connects the downstream side in the flow direction in the decontamination waste liquid line L11 and the outlet side of the anion resin tower 44. That is, the decontamination waste liquid 58 distributed to the decontamination waste liquid line L11 is introduced from the decontamination waste liquid line L11 into the anion resin tower 44 via the anion resin tower inlet line L14-1. The decontamination waste liquid 58 introduced into the anion resin tower 44 is discharged to the decontamination waste liquid line L11 via the anion resin tower outlet line L14-2.

  The anion resin tower inlet line L14-1 and the anion resin tower outlet line L14-2 of the anion resin tower line L14 are provided with a valve V25 and a valve V26. The valves V25 and V26 are open / close valves, each of which opens and closes an anion resin tower inlet line L14-1 and an anion resin tower outlet line L14-2, thereby anionic resin tower inlet line L14-1 and anion The flow of the decontamination waste liquid 58 in the resin tower outlet line L14-2 is opened and closed.

  The chemical liquid supply unit 45 supplies a chemical liquid containing one or both of an oxidizing agent and a reducing agent to the decontamination waste liquid 58 to the decontamination waste liquid line L11. The chemical solution supply unit 45 includes a first chemical solution supply unit 55 that supplies the first chemical solution 52, a second chemical solution supply unit 56 that supplies the second chemical solution 53, and a third chemical solution supply unit 57 that supplies the third chemical solution 54. Have.

  The first chemical liquid supply unit 55 is connected to the first chemical liquid supply line L15-1. The first chemical liquid supply line L15-1 is provided with a pump P2, and the first chemical liquid 52 is sent out from the first chemical liquid supply unit 55 by the pump P2. The first chemical liquid supply line L15-1 is provided with a valve V31 which is an on-off valve, and opens and closes the flow of the first chemical liquid 52 in the first chemical liquid supply line L15-1 by opening and closing the valve V31. The first chemical liquid supply line L15-1 is connected to the decontamination waste liquid line L11 via the chemical liquid supply common line L15-4.

As the first chemical liquid 52, one containing at least one of permanganic acid (HMnO ₄ ), potassium permanganate (KMnO ₄ ), a nitric hydrofluoric acid mixed liquid of nitric acid and hydrofluoric acid, or the like is used. Permanganic acid and potassium permanganate are illustrated as examples of the oxidizing agent, and any chemical (oxidizing agent) having an equivalent oxidizing power can be used. The first chemical liquid 52 is sent from the first chemical liquid supply unit 55 to the decontamination waste liquid line L11 via the first chemical liquid supply line L15-1 and the chemical liquid supply common line L15-4 by the pump P2, and is supplied to the decontamination target system 41. Is done. And the 1st chemical | medical solution 52 dissolves the chromium (Cr) type oxide etc. which have adhered to the structural component which comprises the decontamination object system | strain 41 in a liquid as chromic acid, and removes it from a structural component. As a density | concentration of the 1st chemical | medical solution 52, 0.005 mass% or more and 0.5 mass% or less are preferable, More preferably, it is 0.01 mass% or more and 0.3 mass% or less, More preferably, it is 0.01 mass% or more and 0 .1% by mass or less.

  The second chemical liquid supply unit 56 is connected to the second chemical liquid supply line L15-2. The second chemical liquid supply line L15-2 is provided with a pump P3, and the second chemical liquid 53 is sent out from the second chemical liquid supply unit 56 by the pump P3. The second chemical liquid supply line L15-2 is provided with a valve V32 that is an on-off valve, and opens and closes the flow of the second chemical liquid 53 in the second chemical liquid supply line L15-2 by opening and closing the valve V32. The second chemical liquid supply line L15-2 is connected to the decontamination waste liquid line L11 via the chemical liquid supply common line L15-4.

The second chemical-liquid 53, oxalic acid _{(H 2 C 2 O 4)} , citric acid _{(C 6 H 8 O 74)} , is used which contains any one or more of such nitric hydrofluoric acid mixture. The mixed liquid of oxalic acid, citric acid, and nitric hydrofluoric acid is exemplified as an example of the reducing agent, and any chemical (reducing agent) having an equivalent reducing power can be used. The second chemical liquid 53 is sent from the second chemical liquid supply unit 56 to the decontamination waste liquid line L11 through the second chemical liquid supply line L15-2 and the chemical liquid supply common line L15-4 by the pump P3, and is supplied to the decontamination target system 41. Is done. And the 2nd chemical | medical solution 53 dissolves the iron (Fe) type oxide, nickel (Ni) type oxide, etc. which have adhered to the structural component which comprises the decontamination object system | strain 41 in a liquid, and removes it from a structural component. To do. The second chemical 53 reduces Cr oxide and unreacted permanganic acid. As a density | concentration of the 2nd chemical | medical solution 53, 0.005 mass% or more and 0.5 mass% or less are preferable, More preferably, 0.01 mass% or more and 0.3 mass% or less, More preferably, 0.01 mass% or more 0 .1% by mass or less.

  The third chemical liquid supply unit 57 is connected to the third chemical liquid supply line L15-3. The third chemical liquid supply line L15-3 is provided with a pump P4, and the third chemical liquid 54 is sent out from the third chemical liquid supply unit 57 by the pump P4. The third chemical liquid supply line L15-3 is provided with a valve V33 which is an on-off valve, and opens and closes the flow of the third chemical liquid 54 in the third chemical liquid supply line L15-3 by opening and closing the valve V33. The third chemical liquid supply line L15-3 is connected to the decontamination waste liquid line L11 via the chemical liquid supply common line L15-4.

As the third chemical liquid 54, hydrogen peroxide (H ₂ O ₂ ) or the like is used. H ₂ O ₂ is exemplified as an example of the oxidizing agent, and any chemical (oxidizing agent) having an equivalent oxidizing power can be used. The third chemical liquid 54 is sent from the third chemical liquid supply unit 57 to the decontamination waste liquid line L11 via the third chemical liquid supply line L15-3 and the chemical liquid supply common line L15-4 by the pump P4. And the 3rd chemical | medical solution 54 decomposes | disassembles the oxalic acid of the oxalic acid chelate contained in the decontamination waste liquid 58 by irradiating with an ultraviolet-ray.

  In addition, the 1st chemical | medical solution 52, the 2nd chemical | medical solution 53, and the 3rd chemical | medical solution 54 which were mentioned above combine the chemical | medical agent which melt | dissolves a deposit | attachment suitably according to the kind of film | membrane adhering to the structural component which comprises the decontamination object system | strain 41. Are preferably used.

  The ultraviolet tower 46 includes a storage tank 65 that stores the decontamination waste liquid 58 and an ultraviolet irradiation device 66 that irradiates the storage tank 65 with ultraviolet light, and irradiates the decontamination waste liquid 58 with ultraviolet light.

  The ultraviolet tower 46 is provided in a decontamination waste liquid extraction line L16 that is diverted from the decontamination waste liquid line L11. The decontamination waste liquid extraction line L16 is provided with valves V41 and V42 which are on-off valves on one end side and the other end side connected to the decontamination waste liquid line L11 via the ultraviolet tower 46. Then, the flow of the decontamination waste liquid 58 in the decontamination waste liquid extraction line L16 is opened and closed by opening and closing the valves V41 and V42. Further, in the decontamination waste liquid line L11, a valve 14 as an on-off valve is provided between one end and the other end to which the decontamination waste liquid extraction line L16 is connected, and the position of the decontamination waste liquid extraction line L16 by opening and closing the valve V14. The flow of the decontamination waste liquid 58 in the decontamination waste liquid line L11 is opened and closed.

  The valve V13 is an on-off valve provided at an end of the decontamination waste liquid line L11 on the side where the decontamination waste liquid 58 is introduced into the decontamination target system 41, and is connected to the decontamination target liquid line 41 from the decontamination waste liquid line L11. The flow of the decontamination waste liquid 58 to be introduced and the backflow of the decontamination waste liquid 58 from the decontamination target system 41 to the decontamination waste liquid line L11 are opened and closed.

  The decontamination target system 41 is provided with a decontamination waste liquid discharge line L17. The decontamination waste liquid discharge line L17 is a line for discarding the decontamination waste liquid 58 from the decontamination target system 41. That is, the decontamination waste liquid 58 in the decontamination target system 41 is discharged through the decontamination waste liquid discharge line L17, and then placed in a waste container such as a drum can and discarded. The decontamination waste liquid discharge line L17 is provided with a valve V15 that is an on-off valve, and opens and closes the flow of the decontamination waste liquid 58 in the decontamination waste liquid discharge line L17 by opening and closing the valve V15.

  Moreover, the waste liquid processing system 40 of this embodiment has the control part 47, as shown in FIG. The control unit 47 includes valves V11, V12, V13, V14, V15, V21, V22, V23, V24, V25, V26, V31, V32, V33, V41, V42, and pumps P1, P2, P3, P4, and ultraviolet irradiation. It is electrically connected to the device 66 and controls them centrally. That is, the control unit 47 automatically controls the operation of the waste liquid processing system described below, and automatically performs the steps of the waste liquid processing method described below.

  FIG. 3 is a flowchart showing the procedure of the waste liquid processing method, which is the operation of the waste liquid processing system according to the present embodiment. 4-9 is explanatory drawing which shows the process of the waste-liquid processing method which concerns on this embodiment. 4 to 9, the valves V11, V12, V13, V14, V15, V21, V22, V23, V24, V25, V26, V31, V32, V33, V41, and V42 are in the open operation state. Yes, black paint indicates closed operation.

  As shown in FIG. 3, the operation of the waste liquid treatment system according to the present embodiment, and the waste liquid treatment method includes the following steps.

  The first chemical liquid 52 containing permanganic acid is supplied to the decontamination target system 41, and Cr contained in the deposits attached to the structural parts in the decontamination target system 41 is dissolved in at least the first chemical liquid 52, and decontamination is performed. The structural parts in the target system 41 are decontaminated (first chemical supply process: step S11).

  The second chemical liquid 53 containing oxalic acid is supplied to the decontamination target system 41 (decontamination waste liquid 58 supplied with the first chemical liquid 52), and Fe contained in the deposits attached to the structural components in the decontamination target system 41. Ni is dissolved in at least the second chemical solution 53 to decontaminate the structural parts in the decontamination target system 41 (second chemical solution supply step: step S12).

  The decontamination waste liquid 58 that has been supplied with the first chemical liquid 52 and the second chemical liquid 53 to decontaminate the decontamination target system 41 is supplied to the inorganic ion exchanger filling tank 42 and dissolved in the decontamination waste liquid 58. The metal ions are adsorbed on the inorganic ion exchanger (inorganic ion exchanger permeation step: step S13).

  The decontamination waste liquid 58 from which the predetermined metal ions have been removed through the inorganic ion exchanger filling tank 42 is supplied to the cation resin tower 43 and other metal ions of the predetermined metal ions dissolved in the decontamination waste liquid 58. Is adsorbed on the cation exchange resin (cation resin permeation step: step S14).

After supplying the third chemical liquid 54 containing H ₂ O ₂ to the decontamination waste liquid 58 from which the metal ions have been removed through the inorganic ion exchanger filling tank 42 and the cation resin tower 43, the decontamination supplied with the third chemical liquid 54 The waste liquid 58 is supplied to the ultraviolet tower 46 and irradiated with ultraviolet rays to decompose oxalic acid contained in the decontamination waste liquid 58 (third chemical liquid supply / UV irradiation step: step S15).

  The decontamination waste liquid 58 from which oxalic acid has been removed through the ultraviolet tower 46 is supplied to the anion resin tower 44, and the metal ions and oxalic acid remaining in the decontamination waste liquid 58 are adsorbed to the anion exchange resin (permeation of the anion resin). Process: Step S16).

  As shown in FIG. 4, in the first chemical liquid supply step of Step S11, the first chemical liquid 52 containing permanganic acid is supplied from the first chemical liquid supply section 55 to the first chemical liquid supply line L15-1 and the chemical liquid supply common line L15-4. The first chemical liquid 52 is distributed to the decontamination waste liquid line L11 and supplied to the decontamination target system 41.

  As a result, Cr oxide or the like contained in the deposit that has adhered to the structural parts in the decontamination target system 41 is dissolved in the first chemical liquid 52 as at least chromic acid, and from the structural parts in the decontamination target system 41 By removing, the structural parts are decontaminated.

  After the first chemical liquid 52 in the decontamination target system 41 is extracted from the decontamination target system 41 to the decontamination waste liquid line L11 by the pump P1, the decontamination waste liquid line L11 is circulated and returned to the decontamination target system 41. ing. Specifically, the first chemical liquid 52 in the decontamination target system 41 is extracted to the decontamination waste liquid line L11 as the decontamination waste liquid 58, and after the impurities in the decontamination waste liquid 58 are removed by the filter 59, the heating is performed. The tank 61 is heated to a predetermined temperature. The decontamination waste liquid 58 is supplied again to the decontamination target system 41 while being heated.

  In addition, when removing the impurities in the decontamination waste liquid 58 with the filter 59 or when the amount of the decontamination waste liquid 58 is reduced by heating in the heating tank 61, the first in the decontamination target system 41. The first chemical liquid 52 may be additionally supplied from the first chemical liquid supply unit 55 to the decontamination waste liquid 58 so that the chemical liquid 52 can be sufficiently supplied.

  The number of circulations in which the first chemical liquid 52 (decontamination waste liquid 58) is circulated through the decontamination waste liquid line L11 and supplied to the decontamination target system 41 may be one or multiple times.

  In this way, by circulating the decontamination waste liquid line L11 while the first chemical liquid 52 is heated, Cr oxides and the like contained in the deposits attached to the structural components in the decontamination target system 41 are decontamination targets. It is removed from the structural parts in the system 41, and the structural parts in the system 41 to be decontaminated are decontaminated.

  As shown in FIG. 5, in the second chemical liquid supply process of step S <b> 12, after the first chemical liquid supply process, the second chemical liquid 53 containing oxalic acid is added to the decontamination waste liquid 58 supplied with the first chemical liquid 52. The supply unit 56 sends the second chemical liquid 53 to the decontamination waste liquid line L11 through the second chemical liquid supply line L15-2 and the chemical liquid supply common line L15-4, and distributes the second chemical liquid 53 to the decontamination waste liquid line L11. 41.

  Thereby, Fe oxide, Ni oxide, etc. contained in the deposits attached to the structural parts in the decontamination target system 41 are dissolved in the second chemical liquid 53 and removed from the structural parts in the decontamination target system 41. In this way, the structural parts are decontaminated. Moreover, Cr oxide and unreacted permanganic acid are reduced.

  The second chemical liquid 53 in the decontamination target system 41 is extracted from the decontamination target system 41 to the decontamination waste liquid line L11 by the pump P1, and then circulated through the decontamination waste liquid line L11 to be returned to the decontamination target system 41. ing. Specifically, the second chemical liquid 53 in the decontamination target system 41 is extracted as the decontamination waste liquid 58 to the decontamination waste liquid line L11, and after removing impurities in the decontamination waste liquid 58 by the filter 59, heating is performed. The tank 61 is heated to a predetermined temperature. The decontamination waste liquid 58 is supplied again to the decontamination target system 41 while being heated.

  In addition, when the impurities in the decontamination waste liquid 58 are removed by the filter 59 or when the amount of the decontamination waste liquid 58 is reduced by heating in the heating tank 61, the second in the decontamination target system 41. The second chemical liquid 53 may be additionally supplied from the second chemical liquid supply unit 56 to the decontamination waste liquid 58 so that the chemical liquid 53 can be sufficiently supplied.

  The number of circulations in which the second chemical liquid 53 (decontamination waste liquid 58) is circulated through the decontamination waste liquid line L11 and supplied to the decontamination target system 41 may be one or multiple times.

  Thus, by circulating the decontamination waste liquid line L11 while the second chemical liquid 53 is heated, Fe oxide, Ni oxide, etc. contained in the deposits attached to the structural parts in the decontamination target system 41 are The structural parts in the decontamination target system 41 are removed, and the structural parts in the decontamination target system 41 are decontaminated.

  As shown in FIG. 6, the inorganic ion exchanger permeation process of step S <b> 13 is a decontamination waste liquid generated when the structural parts in the decontamination target system 41 are decontaminated in the first chemical liquid supply process and the second chemical liquid supply process. 58 is supplied to the inorganic ion exchanger filling tank 42, and predetermined metal ions (Co, Ni) dissolved in the decontamination waste liquid 58 are adsorbed on the inorganic ion exchanger.

  Further, as shown in FIG. 6, in the cationic resin permeation process of step S14, predetermined metal ions (Co, Ni) dissolved in the decontamination waste liquid 58 in the inorganic ion exchanger permeation process are converted into inorganic ion exchangers. The decontamination waste liquid 58 that has been removed by adsorption is supplied to the cation resin tower 43, and other metal ions of the predetermined metal ions dissolved in the decontamination waste liquid 58 are adsorbed on the cation exchange resin.

  The inorganic ion exchanger permeation process in step S13 and the cation resin permeation process in step S14 are performed simultaneously as shown in FIG. 6, and the decontamination waste liquid 58 is decontaminated in the inorganic ion exchanger permeation process and the cation resin permeation process. It is circulated in the waste liquid line L11 and supplied to the decontamination target system 41. This circulation is performed one or more times, and metal ions are removed from the decontamination waste liquid 58 by the inorganic ion exchanger filling tank 42 and the cation resin tower 43.

  Moreover, you may perform separately the inorganic ion exchanger permeation | transmission process of step S13, and the cation resin permeation | transmission process of step S14. In this case, in the inorganic ion exchanger permeation step, the decontamination waste liquid 58 is circulated through the decontamination waste liquid line L11 and supplied to the decontamination target system 41, and this circulation is performed one or more times in the inorganic ion exchanger filling tank 42. A predetermined metal ion is removed from the decontamination waste liquid 58. Thereafter, in the cation resin permeation step, the decontamination waste liquid 58 is circulated through the decontamination waste liquid line L11 and supplied to the decontamination target system 41. To remove other metal ions.

As shown in FIG. 7, in the third chemical solution supply / UV irradiation process of step S < _b > 15, after the cationic resin permeation process, the third chemical solution 54 containing H ₂ O ₂ is transferred from the third chemical solution supply unit 57 to the third chemical solution supply line. It sends out to the decontamination waste liquid line L11 via L15-3 and chemical | medical solution supply common line L15-4, and mixes with the decontamination waste liquid 58. FIG. Thereafter, the decontamination waste liquid 58 is supplied to the storage tank 65 of the ultraviolet tower 46 through the decontamination waste liquid extraction line L16. UV light is irradiated to the decontamination waste liquid 58 from the ultraviolet irradiation device 66 in the storage tank 65, and oxalic acid contained in the decontamination waste liquid 58 is reduced and decomposed.

  Thereafter, the decontamination waste liquid 58 in which oxalic acid has been decomposed is discharged from the storage tank 65 and supplied from the decontamination waste liquid extraction line L16 to the decontamination target system 41 through the decontamination waste liquid line L11.

  The third chemical liquid 54 (decontamination waste liquid 58) may be circulated in the decontamination waste liquid line L11 and supplied to the storage tank 65 through the decontamination waste liquid extraction line L16.

  In this embodiment, the third chemical solution supply / UV irradiation step may be performed simultaneously with the inorganic ion exchanger permeation step and the cation resin permeation step as shown in FIG. May be performed separately after the inorganic ion exchanger permeation step and the cation resin permeation step.

  As shown in FIG. 8, in the anion resin permeation process of step S16, after the third chemical liquid supply / UV irradiation process, the decontamination waste liquid 58 is supplied to the anion resin tower 44, and the decontamination waste liquid 58 from which oxalic acid has been removed. Is passed through the anion resin tower 44, and metal ions, which are anions remaining in the decontamination waste liquid 58, oxalic acid that could not be decomposed by the ultraviolet tower 46, are adsorbed on the anion exchange resin for treatment.

  The anion resin permeation process of step S16 performs the inorganic ion exchanger permeation process of step S13 and the cation resin permeation process of step S14 simultaneously as shown in FIG. In the anion resin permeation step, the decontamination waste liquid 58 is circulated in the decontamination waste liquid line L11 and supplied to the decontamination target system 41. This circulation is performed once or more, and is an anion remaining in the decontamination waste liquid 58 in the anion resin tower 44 while removing metal ions from the decontamination waste liquid 58 in the inorganic ion exchanger filling tank 42 and the cation resin tower 43. Removes metal ions and oxalic acid.

  Further, the anion resin permeation process of step S16 may be performed separately from the inorganic ion exchanger permeation process of step S13 and the cation resin permeation process of step S14. In this case, the decontamination waste liquid 58 is circulated in the decontamination waste liquid line L11 and supplied to the decontamination target system 41, and this circulation is performed once or more, and the anion remains in the decontamination waste liquid 58 in the anion resin tower 44. Removes metal ions and oxalic acid.

  After the anion resin permeation step, the decontamination of the structural parts of the decontamination target system 41 is completed. In this case, as shown in FIG. 9, the decontamination waste liquid 58 is discharged from the decontamination waste liquid discharge line L17 and is subjected to waste liquid treatment. The decontamination waste liquid 58 subjected to the waste liquid treatment is disposed in a drum can.

  In the above-described embodiment, the inorganic ion exchanger filling tank 42 and the cation resin tower 43 are connected to the decontamination waste liquid line L11 independently through the inorganic ion exchanger filling tank line L12 and the cation resin tower line L13. This is not the case. Specifically, as shown in FIG. 10, an inorganic ion exchanger filling tank outlet line L12-2 of the inorganic ion exchanger filling tank line L12, and a cation resin tower inlet line L13-1 of the cation resin tower line L13, Instead of connecting to the decontamination waste liquid line L11, the relay line L18 may be used for connection.

  Moreover, in embodiment mentioned above, the 3rd chemical | medical solution supply and UV irradiation process of step S15 are not essential. Therefore, in this case, the configuration related to the third chemical liquid supply unit 57 and the configuration related to the ultraviolet tower 46 may not be provided.

  In the above-described embodiment, each process is performed while the decontamination waste liquid 58 is circulating in the decontamination waste liquid line L11. However, the present invention is not limited to this, and the structural part in the decontamination target system 41 You may perform each process through each line according to the decontamination condition of prefectural goods and the decontamination waste liquid 58. FIG.

  Further, in the above-described embodiment, the case of decontaminating the structural parts installed in the nuclear power plant has been described. However, the present invention is not limited to this, and was used for facilities that treated harmful substances including radioactive substances. The same can be used in the case of decontamination of structural parts.

  As described above, the waste liquid treatment system 40 of the present embodiment has the decontamination waste liquid line L11 through which the decontamination waste liquid 58 generated when the decontamination target system 41 is decontaminated and the decontamination waste liquid line L11. An inorganic ion exchanger filling tank 42 provided with an inorganic ion exchanger for adsorbing predetermined metal ions contained in the decontamination waste liquid 58, and an inorganic ion exchanger filling tank 42 provided in the decontamination waste liquid line L11. The cation resin tower 43 provided with a cation exchange resin that adsorbs other metal ions of the predetermined metal ions contained in the decontamination waste liquid 58 that has passed through the decontamination waste liquid 58, and the decontamination through the cation resin tower 43 provided in the decontamination waste liquid line L11. An anion resin tower 44 provided with an anion exchange resin that adsorbs anions contained in the dyeing waste liquid 58.

  Moreover, the waste liquid treatment method of this embodiment is an inorganic ion exchanger that adsorbs a predetermined metal ion dissolved in the decontamination waste liquid 58 generated when the decontamination target system 41 is decontaminated to the inorganic ion exchanger. A permeation step, a cation resin permeation step for adsorbing other metal ions of the predetermined metal ions dissolved in the decontamination waste liquid after the permeation step of the inorganic ion exchanger, and a cation resin permeation step. An anion resin permeation step of adsorbing the anion in the dyeing waste liquid 58 to the anion exchange resin.

  In this waste liquid treatment system 40 and waste liquid treatment method, after removing predetermined metal ions in the decontamination waste liquid 58 generated by decontamination of the structural parts constituting the decontamination target system 41 in the inorganic ion exchanger filling tank 42. Then, the other metal ions in the decontamination waste liquid 58 are removed by the cation resin tower 43, and then the remaining metal ions and oxalic acid in the decontamination waste liquid 58 are removed by the anion resin tower 44.

  That is, since the decontamination waste liquid 58 generated by decontaminating the structural parts constituting the decontamination target system 41 contains a radioactive substance, the inorganic ion exchanger in the inorganic ion exchanger filling tank 42 has a predetermined metal. The radioactive substance accompanying the ions is adsorbed, the radioactive substance accompanying the other metal ions is adsorbed on the cation exchange resin of the cation resin tower 43, and the anion remaining in the decontamination waste liquid 58 is absorbed on the anion exchange resin of the anion resin tower 44. The radioactive material accompanying the water is adsorbed, and the inorganic ion exchanger, the cation exchange resin and the anion exchange resin become secondary waste contaminated with the radioactive material. However, since the inorganic ion exchanger is adsorbed only with a radioactive substance accompanying a predetermined metal ion and is an inorganic substance, it does not generate hydrogen gas due to radioactive decomposition like an organic substance. Even if it is absorbed and becomes a high dose, it can be solidified and solidified to be buried at the disposal site. The cation exchange resin adsorbs radioactive substances accompanied by metal ions and is an organic substance. However, since the radioactive substances accompanying predetermined metal ions are adsorbed on the inorganic ion exchanger, the radiation dose is low and incineration disposal. can do. In addition, the anion exchange resin adsorbs radioactive substances accompanying metal ions, oxalic acid, etc., and is an organic substance. However, the inorganic ion exchanger adsorbs radioactive substances accompanying predetermined metal ions, and further, a cation exchange resin. Since a radioactive substance accompanied by other metal ions is adsorbed on the metal ions, the radiation dose is low and can be incinerated.

  Therefore, if the waste liquid treatment system 40 and the waste liquid treatment method according to this embodiment are used, the radiation dose of the cation exchange resin and the anion exchange resin generated as secondary waste can be reduced. As a result, the inorganic ion exchanger can be disposed as a waste and the cation exchange resin and the anion exchange resin can be incinerated. Therefore, the waste liquid treatment system 40 according to the present embodiment can dispose of waste that could not be disposed by using a conventionally used decontamination solution treatment method.

  Moreover, in the waste liquid processing system 40 of this embodiment, it is preferable to set it as the following structures.

  That is, in the waste liquid treatment system 40 of this embodiment, the inorganic ion exchanger in the inorganic ion exchanger filling tank 42 selectively adsorbs cobalt and nickel, which are predetermined metal ions.

  According to the waste liquid treatment system 40, cobalt and nickel, which are predetermined metal ions, become a high dose due to decontamination, and the cobalt and nickel are selectively adsorbed by the inorganic ion exchanger, whereby a high removal rate (approximately 90%). % To 95%), and the radiation dose of the cation exchange resin by adsorbing other metal ions with the subsequent cation exchange resin can be kept low. As a result, by adsorbing predetermined metal ions, the cation exchange resin can be suppressed to a radiation dose within a range that can be incinerated.

  In the waste liquid treatment system 40 of the present embodiment, the inorganic ion exchanger is zeolite.

  According to the waste liquid treatment system 40, zeolite adsorbs cobalt and nickel, which are predetermined metal ions, and can remove radioactive substances with a high removal rate (approximately 90% to 95%). The radiation dose of the cation exchange resin by adsorbing other metal ions with the cation exchange resin can be kept low. As a result, by adsorbing the prescribed metal ions, the inorganic ion exchanger can be suppressed to a radiation dose that can be buried at the disposal site, and the cation exchange resin can be suppressed to a radiation dose that can be incinerated. Can do.

  Further, in the waste liquid treatment system 40 of the present embodiment, the decontamination waste liquid line L11 and the inorganic ion exchanger filling tank line L12 connecting the inlet side and the outlet side of the inorganic ion exchanger filling tank 42, and the decontamination waste liquid line L11. A cation resin tower line L13 connecting the inlet side and the outlet side of the cation resin tower 43, and an anion resin tower line L14 connecting the decontamination waste liquid line L11 and the inlet side and outlet side of the anion resin tower 44. Have.

  According to the waste liquid treatment system 40, the inorganic ion exchanger is provided on the inlet and outlet sides of the inorganic ion exchanger filling tank 42, on the inlet and outlet sides of the cation resin tower 43, and on the inlet and outlet sides of the anion resin tower 44, respectively. By being connected to the decontamination waste liquid line L11 independently by the filling tank line L12, the cation resin tower line L13, and the anion resin tower line L14, the inorganic ion exchanger filling tank 42, the cation resin tower 43, and the anion resin tower 44 Maintenance can be improved because each maintenance can be performed.

  Moreover, in the waste liquid processing system 40 of this embodiment, the inorganic ion exchanger filling tank inlet line L12-1 which connects the decontamination waste liquid line L11 and the inlet side of the inorganic ion exchanger filling tank 42, and inorganic ion exchanger filling A relay line L18 connecting the outlet side of the tank 42 and the inlet side of the cation resin tower 43; a cation resin tower outlet line L13-2 connecting the outlet side of the cation resin tower 43 and the decontamination waste liquid line L11; An anion resin tower line L14 that connects the dye waste liquid line L11 and the inlet side and the outlet side of the anion resin tower 44;

  According to this waste liquid treatment system 40, the outlet side of the inorganic ion exchanger filling tank 42 and the inlet side of the cation resin tower 43 are connected by the relay line L18, so that the cation resin is removed from the inorganic ion exchanger filling tank 42. The decontamination waste liquid 58 can be directly introduced into the tower 43 continuously. For this reason, compared with the structure which connects the inorganic ion exchanger filling tank 42 and the cation resin tower 43 to the decontamination waste liquid line L11 independently, a valve can be abbreviate | omitted and it supplies to the inorganic ion exchanger filling tank 42 Since the decontamination waste liquid 58 after being supplied is always supplied to the cation resin tower 43, the processing efficiency can be improved.

  Moreover, in the waste liquid processing method of this embodiment, it is preferable to do as follows.

  That is, in the waste liquid treatment method of this embodiment, the inorganic ion exchanger permeation step selectively adsorbs cobalt and nickel, which are predetermined metal ions, to the inorganic ion exchanger.

  According to this waste liquid treatment method, cobalt and nickel, which are predetermined metal ions, become a high dose by decontamination, and a high removal rate (approximately 90%) is obtained by selectively adsorbing cobalt and nickel with an inorganic ion exchanger. ˜95%), the radioactive substance can be removed, and the radiation dose of the cation exchange resin by adsorbing other metal ions with the subsequent cation exchange resin can be kept low. As a result, by adsorbing predetermined metal ions, the cation exchange resin can be suppressed to a radiation dose within a range that can be incinerated.

40 Waste Liquid Treatment System 41 System for Decontamination 42 Inorganic Ion Exchanger Filling Tank 43 Cationic Resin Tower 44 Anion Resin Tower 58 Decontamination Waste Liquid L11 Decontamination Waste Liquid Line L12 Inorganic Ion Exchanger Filling Tank Line L12-2 Inorganic Ion Exchanger Filling Tank Outlet line L12-1 Inorganic ion exchanger filling tank inlet line L13 Cationic resin tower line L13-2 Cationic resin tower outlet line L13-1 Cationic resin tower inlet line L14 Anion resin tower line L14-2 Anion resin tower outlet line L14-1 Anion resin tower entrance line L18 Relay line

Claims (5)

A decontamination waste liquid line for distributing a decontamination waste liquid generated when the decontamination target system is decontaminated
An inorganic ion exchanger filling tank provided with an inorganic ion exchanger that is provided in the decontamination waste liquid line and adsorbs predetermined metal ions contained in the decontamination waste liquid;
A cation resin tower provided with a cation exchange resin that is provided in the decontamination waste liquid line and adsorbs other metal ions of the predetermined metal ion contained in the decontamination waste liquid passed through the inorganic ion exchanger filling tank;
An anion resin tower provided with an anion exchange resin that is provided in the decontamination waste liquid line and adsorbs anions contained in the decontamination waste liquid passed through the cation resin tower;
An inorganic ion exchanger filling tank inlet line connecting the decontamination waste liquid line and an inlet side of the inorganic ion exchanger filling tank;
A relay line connecting the outlet side of the inorganic ion exchanger filling tank and the inlet side of the cation resin tower;
A cation resin tower outlet line connecting the outlet side of the cation resin tower and the decontamination waste liquid line;
An anion resin tower line connecting the decontamination waste liquid line and an inlet side and an outlet side of the anion resin tower;
A waste liquid treatment system comprising:   The waste liquid treatment system according to claim 1, wherein the inorganic ion exchanger in the inorganic ion exchanger filling tank selectively adsorbs cobalt and nickel, which are predetermined metal ions.   The waste liquid treatment system according to claim 1 or 2, wherein the inorganic ion exchanger is zeolite. An inorganic ion exchanger permeation step for adsorbing a predetermined metal ion dissolved in the decontamination waste liquid generated when the decontamination target system is decontaminated to the inorganic ion exchanger;
A cation resin permeation step for adsorbing other metal ions of a predetermined metal ion dissolved in the decontamination waste liquid after the inorganic ion exchanger permeation step to the cation exchange resin;
An anion resin permeation step for adsorbing the anion in the decontamination waste liquid to the anion exchange resin after the cation resin permeation step;
Only including,
A waste liquid treatment method, wherein the inorganic ion exchanger permeation step and the cation resin permeation step are performed simultaneously . The waste liquid treatment method according to claim 4 , wherein the inorganic ion exchanger permeation step selectively adsorbs cobalt and nickel, which are predetermined metal ions, to the inorganic ion exchanger.

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